You all should read the Descent into Avernus adventure and the Baldur's Gate comics: Minsc and Boo were indeed petrified somewhere around 137X D.R. (can't remember the exact date). So the ''statue'' that had supposedly been comissioned to put in Baldur's Gate for everyone to see was initially Minsc and Boo, petrified. The ''statue'' stayed there until 1480 D.R. when it was unpetrified by a wild surge. The ''statue'' has since been replaced by a real statue.
So yeah, the Minsc we'll probably meet in BG3 is the genuine article.
If that is the case, then that is a clear retcon of previous canon lore, which of course is par for the course with WotC these days. Something from years of canon doesn't quite fit what some jackass writer/producer/game developer wants to do today, no problem. Just retcon it! To these people the FR setting is just a cash-cow and they clearly have no love or respect for it.